.conjunto{
display: flex;
align-items: center;
justify-content: center;
margin: 0px;

}

.quadrado{
display: flex;
background-color: black;
height: 20px;
width: 20px;
border: solid;
align-items: center;
justify-content: center;
margin: 0px;

}

div {
margin: 0px;
}

body {
background-color: white;
margin-left: 0px;
margin-right: 0px;
margin-bottom: 0px;

}